An impure sample of zinc (Zn) is treated with an excess of sulfuric acid ( H 2 SO 4 ) to form zinc sulfate ( ZnSO 4 ) and molecular hydrogen ( H 2 ) . (a) Write a balanced equation for the reaction. (b) If 0.0764 g of H 2 is obtained from 3.86 g of the sample, calculate the percent purity of the sample. (c) What assumptions must you make in part (b)?
An impure sample of zinc (Zn) is treated with an excess of sulfuric acid ( H 2 SO 4 ) to form zinc sulfate ( ZnSO 4 ) and molecular hydrogen ( H 2 ) . (a) Write a balanced equation for the reaction. (b) If 0.0764 g of H 2 is obtained from 3.86 g of the sample, calculate the percent purity of the sample. (c) What assumptions must you make in part (b)?
Solution Summary: The author explains how the balanced equation, percent purity of sample, and assumptions made in part (b) are to be determined.
An impure sample of zinc (Zn) is treated with an excess of sulfuric acid
(
H
2
SO
4
)
to form zinc sulfate
(
ZnSO
4
)
and molecular hydrogen
(
H
2
)
. (a) Write a balanced equation for the reaction. (b) If 0.0764 g of
H
2
is obtained from 3.86 g of the sample, calculate the percent purity of the sample. (c) What assumptions must you make in part (b)?
Question 11 of 18 (1 point) Question Attempt: 3 of
How many signals do you expect in the 'H NMR spectrum for this molecule?
Br
Br
Write the answer below.
Also, in each of the drawing areas below is a copy of the molecule, with Hs shown. In each copy, one of the H atoms is colored red. Highlight in red all other H
atoms that would contribute to the same signal as the H already highlighted red.
Note for advanced students: In this question, any multiplet is counted as one signal.
Number of signals in the 'H NMR spectrum.
1
For the molecule in the top drawing area, highlight in red any other H atoms that will contribute to
the same signal as the H atom already highlighted red.
If no other H atoms will contribute, check the box at right.
No additional Hs to color in top
molecule
Check
For the molecule in the bottom drawing area, highlight in red any other H atoms that will contribute
to the same signal as the H atom already highlighted red.
If no other H atoms will contribute, check the box…
Organic Chemistry
Esterification reactions
1. Write the steps to prepare ester.
2. Write complete reaction of ethanol and acetic acid to make ester.
3. What does ester smell like? What are the uses of ester.
4. What the role of sulfuric acid in the esterification reaction
11. Complete the following esterification reaction with names of all the reactants and products under.
Hint: Remove the water and end up with ester
R-C-OH + ROH
R-C-OR + H₂O
A carboxylic acid
An alcohol
An ester
Water
BYJU'S
H-C-C
O-H
Нин
C-C-C-H
HAAA
H O-C-C-C-H
AAA
Ethanoic acid
Propanol
Water Propyl ethanoate
By com
CH3COOH + CH3CH2CH2CH₂CH₂OH →
Practice for alcohols aldehydes and ketones:
12. Draw the structures from the following names mixed of alcohol/aldehyde and ketone:
a. 4-methyl cyclohexanone
b. 3-methyl-2-pentenal
c. 2,3-dimethylcyclohexanone
d. 1,3propanediol or Propane 1,3 diol
13. Write systematic names for the following compounds identify
functional group:
a.
b. (CH3)2CH-C
OH
c) CH(CH₂)--
OH
-,-,
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Step by Step Stoichiometry Practice Problems | How to Pass ChemistryMole Conversions Made Easy: How to Convert Between Grams and Moles; Author: Ketzbook;https://www.youtube.com/watch?v=b2raanVWU6c;License: Standard YouTube License, CC-BY